I know the one for the D2 is listed as a separate part number - check your parts catalog to see if it is for your D7 serial # then try Cat, machinerytrader, and Florin. Mine is dented and comes out but I'm in no hurry to deal with it as the cap can be fitted / removed and it doesn't otherwise give problems. I haven't run it under rated power though, or for any appreciable length of time so it might become an issue for me.
I used a Fernco coupler that has a reducer to get to a smaller size and put cap on it. I got rubber fernco coupler at tractor supply store. It also got water level a little higher in rad, to keep water up in head if working downhill. Not sure about spelling of coupler brand.
3T's up to s/n 19335 had separate neck 4F6386
Does your machine have a brass radiator top tank or is it the later tractor with cast tanks??
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